Types of DR Receptors in Digital Radiography

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What can cause artifacts in CR imaging plates?

High humidity in the room
Using a higher kVp setting
Physical damage like cracks, scuffs, and scratches (correct)
Improper handling of the computer

How can DR artifacts like dead detector elements be addressed?

Replacing the X-ray tube
Increasing the patient's exposure time
Applying software correction (correct)
Using a lower mAs setting

What is the function of a frame grabber in digital imaging systems?

Controls the X-ray tube
Filters out scatter radiation
Converts analog signals to digital signals (correct)
Displays live fluoroscopy images

What does CTDI stand for in radiography?

Computed Tomography Dose Index (D) Signup and view all the answers

In fluoroscopy, what does 'Last Image Hold' refer to?

Displaying the last image captured before radiation is turned off (A) Signup and view all the answers

What is the purpose of Analog-to-Digital Conversion (ADC) in digital radiography?

To assign a digital value representing X-ray exposure at each point on the detector. (A) Signup and view all the answers

What process do Flat Panel Detectors (FPDs) utilize to convert X-rays into digital signals?

Conversion of charges into digital signals using TFTs. (A) Signup and view all the answers

How do Direct FPDs achieve high spatial resolution in digital radiography?

By converting charges into digital signals using TFTs. (D) Signup and view all the answers

What is the main advantage of Digital Radiography (DR) over traditional film-based radiography?

Immediate availability of images without the need for processing. (C) Signup and view all the answers

Which component is responsible for generating electron-hole pairs when X-rays strike in Direct FPDs?

Photoconductive material in the detectors. (B) Signup and view all the answers

What happens during Image Processing in digital radiography?

Corrections are made to improve contrast and sharpness. (B) Signup and view all the answers

What is the main difference between CR and DR in terms of image formation?

CR uses laser scanning to read intensity data from PMT's, while DR reads raw data directly from a TFT array. (C) Signup and view all the answers

What is the purpose of image segmentation in digital radiography?

To establish the location of the collimated border of the image based on the body part and projection. (D) Signup and view all the answers

What is the significance of a look-up table (LUT) in digital radiography?

It is used to display the image with proper density and contrast after post-processing. (A) Signup and view all the answers

In what way does CR differ from DR regarding the need for post-processing?

CR requires immediate post-processing to create a readable diagnostic image, while DR does not. (A) Signup and view all the answers

How does film/screen radiography differ from CR/DR in terms of latitude?

Film/screen radiography lacks latitude as it dictates proper radiation exposure, unlike CR/DR which involve post-processing. (B) Signup and view all the answers

Why is histogram analysis important in digital radiography?

To graphically show how much of the image is exposed at various levels to aid in tone scaling post-processing. (B) Signup and view all the answers

Types of DR Receptors in Digital Radiography

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